CN113107757A - Wind power blade with multistage grid sawteeth and wind turbine generator - Google Patents

Wind power blade with multistage grid sawteeth and wind turbine generator Download PDF

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Publication number
CN113107757A
CN113107757A CN202110414479.3A CN202110414479A CN113107757A CN 113107757 A CN113107757 A CN 113107757A CN 202110414479 A CN202110414479 A CN 202110414479A CN 113107757 A CN113107757 A CN 113107757A
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China
Prior art keywords
blade
grid
sawtooth
stage
sawteeth
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CN202110414479.3A
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Chinese (zh)
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CN113107757B (en
Inventor
徐新峰
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Ningbo Tengshen Technology Development Co ltd
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Beijing Tengshen Technology Co ltd
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Priority to CN202110414479.3A priority Critical patent/CN113107757B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • F03D1/0675—Rotors characterised by their construction elements of the blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/96—Preventing, counteracting or reducing vibration or noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/97—Reducing windage losses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Abstract

The utility model provides a wind-powered electricity generation blade and wind turbine generator system with multistage grid sawtooth, including blade leading edge and blade trailing edge, the sawtooth unit distributes along the longitudinal axis direction at the blade trailing edge of suction surface, the sawtooth unit includes the grid structure, the grid structure includes at least two-stage grid, each stage grid passes through frame structure fixed connection in proper order, each stage grid forms the contained angle that is less than 90 with the horizontal direction that the blade leading edge extends to the blade trailing edge, and each stage grid distributes and arranges the sawtooth and arrange the sawtooth down, it arranges with arranging the sawtooth along the longitudinal axis direction peak staggering down to arrange the sawtooth, it is greater than the outer contained angle that the sawtooth forms rather than the frame that the place was arranged to arrange the sawtooth outward. The arrangement of the multi-stage grid sawteeth and the upper and lower rows of sawteeth effectively improves the mixing capability of the flow separation vortex in the longitudinal axis direction and the mixing capability of the flow vortex far away from the boundary layer.

Description

Wind power blade with multistage grid sawteeth and wind turbine generator
Technical Field
The invention relates to the field of wind power blades, in particular to a wind power blade with multistage grid sawteeth and a wind turbine generator.
Background
Wind energy is increasingly gaining attention from various countries as a clean and pollution-free renewable energy source. With the continuous expansion of the installed capacity and the localization degree of wind power in China, the noise problem of the wind turbine generator gradually appears, and the work and the life of people are interfered.
In the rotation process of the wind power blade, airflow falls off from the tail edge of the blade to generate a vortex. Generally, large vortices generate low-frequency noise, and small vortices generate high-frequency noise; the attenuation of high-frequency noise along with distance and obstacles is fast, and the attenuation of low-frequency noise is difficult, so the common noise reduction principle is a mixed wake vortex to break large vortexes in the wake vortex, thereby achieving the purpose of reducing noise from the root.
The sawtooth structure is arranged at the tail edge of the blade, so that the shedding position of the wake vortex of each section can be changed, the distance between vortex centers is increased, the disturbance of the shedding vortex on the wake flow is inhibited, and further the unsteady pressure pulsation on the surface of the blade and the aerodynamic noise caused by the wake vortex are reduced.
The existing arrangement scheme of the sawtooth structure is mostly converted from the aviation industry, generally shown in fig. 1, and the improvement is mostly evolved by adding structures such as comb teeth on the basis of a single triangle, as shown in fig. 2.
CN106050553A discloses a noise reduction device of big thickness blunt trailing edge airfoil, through fixing a zigzag trailing edge body on blunt trailing edge body's trailing edge plane, improves the aerodynamic characteristics of big thickness blunt trailing edge airfoil, blocks, cuts apart the vortex of airfoil when turbulence intensity is great.
CN103782027B discloses a wind turbine blade with a noise reduction device and related method for improving the noise performance of a blade assembly by providing a first primary flow conditioning device and a first secondary flow conditioning device spaced perpendicular to the longitudinal direction for conditioning boundary layer noise.
However, when the wind power blade operates, surface fluid has a flow trend in the direction of the longitudinal axis pointing to the blade tip due to the centrifugal effect, so that the surface fluid also flows in the direction of the longitudinal axis in the shedding process of the wake vortex, the boundary layer of the blade is seriously separated under the condition of poor aerodynamic performance of the blade, such as stall, the flow in the direction of the longitudinal axis is more obvious, the shedding in the direction of the longitudinal axis of the wake vortex is more obvious under the condition, the noise reduction sawtooth effect in the conventional chord length direction is sharply reduced, and the mixing capability of the flow separation vortex in the direction of the longitudinal; and all the single-grid sawteeth have strong mixing capability only for wake vortexes separated from a blade boundary layer, and have poor mixing capability for flow vortexes far away from the boundary layer.
Therefore, how to effectively improve the mixing capability of the longitudinal axis direction flow separation vortex and the mixing capability of the flow vortex far away from the boundary layer and reduce the aerodynamic noise through reasonable design still remains a challenge.
Disclosure of Invention
The invention aims to provide a wind power blade with multistage grid sawteeth and a wind power unit thereof, which can effectively improve the mixing capability of flow separation vortexes in the longitudinal axis direction and the mixing capability of flow vortexes far away from a boundary layer and reduce aerodynamic noise, and the wind power blade comprises a blade front edge and a blade tail edge, sawteeth units are distributed on the blade tail edge of a suction surface along the longitudinal axis direction, each sawteeth unit comprises a grid structure and a frame structure, the grid structure comprises at least two stages of grids, each stage of grids are sequentially and fixedly connected through the frame structure, and different included angles delta smaller than 90 degrees are formed between each stage of grids and the horizontal direction of the extension of the blade front edge to the blade tail edgenAnd n is the number of stages of the grid.
Each level of grating is distributed with an upper row of saw teeth and a lower row of saw teeth, the upper row of saw teeth and the lower row of saw teeth are arranged along the longitudinal axis direction in a staggered mode, and the lower row of saw teeth forms an outer wide included angle beta with a frame where the lower row of saw teeth are located1Is larger than the outer wide included angle beta formed by the upper row of sawteeth and the frame where the upper row of sawteeth is positioned2。
Further, the angle deltanThe following conditions are satisfied: deltanα + (n-1) θ; wherein alpha is a basic angle value, the numerical range is 20-40 degrees, theta is a gradient angle value, and the numerical range is 5-15 degrees.
Furthermore, the included angle between the lower row of sawteeth and the outer side of the frame where the lower row of sawteeth is positioned is beta1The included angle between the upper row of sawteeth and the outer broad angle of the frame where the upper row of sawteeth is positioned is beta2The following conditions are satisfied: beta is a2＜β1＜30°。
Furthermore, the edges of the upper row of saw teeth and/or the lower row of saw teeth are distributed with a plurality of small saw teeth and/or pits.
Further, the upper row of saw teeth and/or the lower row of saw teeth are made of soft materials.
Furthermore, the sawtooth unit is formed by gluing or buckling and assembling the tail edge of the blade.
Furthermore, the sawtooth units are arranged from the blade tip to the longitudinal axis direction of the blade root, and the length of the sawtooth units is 60% -70% of the length of the blade.
Furthermore, the sawtooth size of each stage of grating is different, the sawtooth size of the next stage of grating is reduced in equal proportion to that of the previous stage of grating, and the value of the equal reduction is 0-80%.
Furthermore, the surface of the frame structure is distributed with holes and/or side teeth and/or pits.
Meanwhile, a wind turbine generator set is provided, and the wind turbine generator set comprises any one of the wind turbine blades with multi-stage grid sawteeth.
The wind power blade with the multi-stage grid sawteeth and the wind power unit thereof can effectively improve the mixing capability of flow separation vortexes in the longitudinal axis direction and the mixing capability of flow vortexes far away from a boundary layer, and reduce aerodynamic noise.
(1) The multistage grids are arranged at an angle, so that the fluid wake vortexes far away from the boundary layer can be mixed;
(2) the arrangement of the upper row of sawteeth and the lower row of sawteeth not only ensures smooth flow of air flow, but also fully disturbs incoming flow through staggered layers and staggered peak sawteeth to achieve the effect of breaking large eddy by mixed flow;
(3) the arrangement that the upper row of sawteeth and the lower row of sawteeth are in wide angles is beneficial to ensuring the smoothness of gas flow, and the wake flow can be further disturbed by the flowing mixing of the lower air flow formed by the upper row of sawteeth and the upper air flow of the lower row of sawteeth;
(4) the large sawtooth bevel edge small sawtooth can be used for better mixing the wake vortex separated by the flow of the blade in the longitudinal axis direction.
Drawings
The invention will be described in further detail with reference to the following figures and detailed description:
FIG. 1 is a prior art conventional sawtooth architecture;
FIG. 2 is a prior art surface comb;
FIG. 3 is a perspective view of a saw tooth unit arrangement provided by the present invention at the trailing edge;
FIG. 4 is a schematic cross-sectional view of a saw tooth unit arrangement provided by the present invention at the trailing edge;
FIGS. 5a-5c are three views of a multi-level grid serration scheme provided in accordance with the present invention, with FIG. 5a being a front view, FIG. 5b being a left side view, and FIG. 5c being a top view;
FIG. 6a is a graph of wake vortex breaking effect of single stage grid serrations, and FIG. 6b is a graph of wake vortex breaking effect of multi-stage grid serrations;
FIG. 7 is a schematic view of the intensity of the air flow in the flow channel between the upper and lower rows of teeth provided by the present invention;
FIG. 8 is an enlarged view of a portion of a serration provided in accordance with the present invention;
fig. 9 is a schematic view of the overall arrangement of a blade provided by the invention.
Description of reference numerals:
11-blade root, 12-blade tip, 21-blade leading edge, 22-blade trailing edge, 31-suction surface, 32-pressure surface, 40-saw tooth unit, 41-grid structure, 411-first-stage grid, 412-second-stage grid, 413-third-stage grid, 42-frame structure, 421-first-stage frame, 422-second-stage frame, 423-third-stage frame, 43-upper-row saw tooth, 44-lower-row saw tooth, 45-small saw tooth,
the X-axis is the horizontal direction (i.e. the horizontal direction of the chord length) in which the front edge of the blade extends to the tail edge of the blade, the Y-axis is the vertical direction (i.e. the vertical direction in the span direction) in which the pressure surface extends to the suction surface,
the Z-axis is the longitudinal axial direction extending from the tip to the root (i.e., the radial direction of the blade).
Detailed Description
The foregoing is merely an overview of the technical solutions of the present invention, and the present invention is described in further detail below in order to make the technical means of the present invention more clearly understood.
The present invention is illustrated in detail by the following examples. They are preferred embodiments of the present invention, and the present invention is not limited by these examples.
Example 1:
the embodiment 1 of the invention provides a wind power blade with multistage grid sawteeth, which comprises the following components:
as shown in fig. 3 and 4, the wind turbine blade includes a blade front edge 21, a blade trailing edge 22, a suction surface 31 and a pressure surface 32, a saw tooth unit 40 is arranged at the blade trailing edge 22 on one side of the suction surface 31, the saw tooth unit 40 includes a grid structure 41 and a frame structure 42, the grid structure 41 includes a third-stage grid, a first-stage grid 411 is connected with the blade trailing edge 22, a second-stage grid 412 is connected with the first-stage grid 411, and a third-stage grid 413 is sequentially and fixedly connected with the second-stage grid 412.
The number of stages for the grids in the grid structure can be adjusted and varied. In one or more embodiments, two or more stages may be employed, with different stages of the grid depending on the noise reduction requirements. Of course, the number of stages of the grid is also related to the arrangement position of the saw tooth units near the trailing edge of the blade.
Each grade of grating can be integrally formed by one piece or can be connected by a plurality of pieces. In this embodiment, the grid is made up of three pieces arranged side by side along the longitudinal axis extending from the blade tip to the blade root.
Example 2:
on the basis of embodiment 1, embodiment 2 of the present invention provides a wind turbine blade with multi-stage grid serrations, as follows:
as shown in fig. 5a, 5b, and 5c, the grating structure 41 includes three stages of gratings, each stage of gratings is sequentially and fixedly connected by the frame structure 42, the first stage of gratings 411, the second stage of gratings 412, and the third stage of gratings 413 respectively include upper rows of saw teeth 43 and lower rows of saw teeth 44, and the upper rows of saw teeth 43 and the lower rows of saw teeth 44 are arranged in a staggered manner along the longitudinal axis direction.
Each stage of grid is composed of upper and lower rows of densely-distributed sawteeth, and the upper and lower rows of sawteeth are arranged in a staggered manner, so that the smooth flowing of airflow is ensured, and the incoming flow is fully disturbed by staggered layers and staggered sawteeth, so that the effect of mixed flow breaking large vortex is achieved.
The first-stage grille 411 forms an included angle delta with the horizontal direction extending from the blade front edge 21 to the blade tail edge 221 Second stage grate 412 forms an angle δ with the horizontal direction in which blade leading edge 21 extends towards blade trailing edge 222The third stage grid 413 forms an angle δ with the horizontal direction in which the leading edge 21 of the blade extends towards the trailing edge 22 of the blade3Angle deltanThe following conditions are satisfied: deltan＝α+(n-1)θ，δn< 90 deg. In the present embodiment, α is 30 ° and θ is 10 °, the first stage grille 411 forms an angle of 30 ° with the horizontal direction from the leading edge 21 of the blade to the trailing edge 22 of the blade, and the second stage grille 411 forms an angle of 30 ° with the horizontal direction from the leading edge 21 of the blade to the trailing edge 22 of the bladeThe angle between the grid 412 and the horizontal direction in which the blade leading edge 21 extends towards the blade trailing edge 22 is 40 °, and the angle between the third stage grid 413 and the horizontal direction in which the blade leading edge 21 extends towards the blade trailing edge 22 is 50 °.
The included angle between each stage of grating and the horizontal direction extending from the front edge of the blade to the tail edge of the blade can be adjusted and changed, and in one or more embodiments, different included angle values are adopted according to different noise reduction requirements.
The included angle of the front edge of each stage of grid blade extending to the tail edge of the blade in the horizontal direction is deltanDenotes the angle deltanThe following conditions are satisfied: deltanα + (n-1) θ; wherein n is the stage number of the grating, alpha is a basic angle value, the numerical range is 20-40 degrees, theta is a gradient angle value, the numerical range is 5-15 degrees, and the included angle between each stage of grating and the horizontal direction extending from the front edge of the blade to the tail edge of the blade is ensured to be less than 90 degrees.
The multi-stage grating is arranged at an angle, and is beneficial to mixing the fluid wake vortex far away from the boundary layer. As shown in fig. 6a and 6 b. The region i of the single-stage grating teeth of fig. 6a still has a part of the large vortices, and the region ii of the multi-stage grating teeth of fig. 6b (the same position as the region i of fig. 6 a) has the large vortices cut down to small vortices. The multi-stage grid sawteeth can further refine and crush the wake vortexes of the single-stage grid sawteeth, so that the low and medium frequency noise is further reduced.
The lower row of saw teeth 44 in the first, second and third stage grids 411, 412 and 413 respectively form a wide angle β with the frame where the saw teeth are located1In the first-stage grating 411, the second-stage grating 412 and the third-stage grating 413, the upper row of saw teeth 43 respectively form a wide angle β with the frame where the saw teeth are located2，β1Greater than beta2And β1、β2Satisfies the following relationship: beta is a2＜β1< 30 deg. In this embodiment, β1Is 10 DEG beta2Is 7 deg..
For wide angle beta1、β2Can be adjusted and changed, and in one or more embodiments, can adopt different angle values to ensure that the outer wide angle is atA value less than 30 deg.. The wide-angle layout helps the unobstructed nature of flow, can be through adjusting upper and lower row sawtooth angle, control its flow and the outflow angle of counterpulsation, and the usable lower air current that goes up the sawtooth formation of row mixes the further disturbance wake with the flow of the upper air current of lower row sawtooth, as shown in fig. 7.
The sizes of the serrations of first-stage grating 411, second-stage grating 412, and third-stage grating 413 may be the same or different. In this embodiment, the sizes of the saw teeth of first-stage grating 411, second-stage grating 412 and third-stage grating 413 are sequentially reduced by 20% in equal proportion, that is, the size of the saw teeth of third-stage grating 413 is 80% of the size of the saw teeth of second-stage grating 412, and the size of the saw teeth of second-stage grating 412 is 80% of the size of the saw teeth of first-stage grating 411.
The number of equal reductions of the sawtooth size for each stage of the grating can be adjusted and varied, and in one or more embodiments, different reductions can be used, ranging from 0 to 80%. The sizes of wake vortex flowing through different stages of sawteeth have scale difference, and the large vortex and the small vortex can be specifically reduced by using the sawteeth with different sizes, so that the middle and low frequency noise is reduced to the maximum extent, namely more middle and low frequency noise can be reduced by the sawteeth with different sizes at different stages.
Each level of grating is composed of a plurality of blades, and the frame structure 42 on a single blade has a plurality of left and right frames, and the existence of the frames can influence the overall noise reduction effect. Therefore, the surface of the frame structure 42 is distributed with one or more of holes, teeth or pits, or reinforced by means of reinforcing ribs, so as to reduce the frame width.
Example 3:
on the basis of embodiments 1 and 2, embodiment 3 of the present invention provides a wind turbine blade with multi-stage grid serrations, as follows:
as shown in FIG. 8, the upper row of saw teeth 43 has a plurality of small saw teeth distributed on the edge thereof, and the lower row of saw teeth 44 has a plurality of small saw teeth distributed on the edge thereof. Here, the specific shape and size of the small serrations are not limited. In one or more embodiments, the small serrations may also be dimples. The small sawteeth are arranged to fully mix wake flow, and the wake vortex separated by the longitudinal axial flow of the mixing blade is better.
The upper row of serrations 43 may be the same or different stiffness as the lower row of serrations 44. The material of the saw teeth adopts soft material. Therefore, when the wake turbulence occurs, the mixed flow can be more fully performed through the shaking of the sawteeth.
Example 4:
on the basis of embodiments 1, 2 and 3, embodiment 4 of the present invention provides a wind turbine blade with multi-stage grid serrations, as follows:
as shown in fig. 9, the saw tooth units 40 are arranged in a direction toward the longitudinal axis of the blade root 11 from the position of the blade tip 12. In the present embodiment, the length of the saw tooth unit 40 is 60% -70% of the total length of the blade.
The assembly mode of the sawtooth units 40 and the blades is not limited, and gluing or buckling can be adopted.
The mounting position of the serration unit 40 is not limited to the one closely contacting the trailing edge 22 of the blade, and may be arranged at a separation point of the suction surface 31 in advance, for example, at a separation area of an axial region where the suction surface 31 extends to the highest point in the vertical direction of the pressure surface 32, or at a stall separation point at another position of the suction surface 31.
Example 5:
on the basis of embodiments 1, 2, 3, and 4, embodiment 5 of the present invention provides a wind turbine generator, which includes:
a wind turbine generator comprises any one of the wind turbine blades with multi-level grid sawteeth provided by embodiments 1-4 of the invention.
The wind power blade with the multistage grid sawteeth and the wind power generator set thereof can effectively improve the mixing capability of the flow separation vortex in the longitudinal axis direction and the mixing capability of the flow vortex far away from the boundary layer, and reduce aerodynamic noise. The multistage grating is arranged at an angle, so that the fluid wake vortex far away from the boundary layer is mixed; the arrangement of the upper row of sawteeth and the lower row of sawteeth not only ensures smooth flow of air flow, but also fully disturbs incoming flow through staggered layers and staggered peak sawteeth to achieve the effect of breaking large eddy by mixed flow; the arrangement that the upper row of sawteeth and the lower row of sawteeth are in wide angles is beneficial to ensuring the smoothness of gas flow, and the wake flow can be further disturbed by the flowing mixing of the lower air flow formed by the upper row of sawteeth and the upper air flow of the lower row of sawteeth; the large sawtooth bevel edge small sawtooth can be used for better mixing the wake vortex separated by the flow of the blade in the longitudinal axis direction.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.

Claims (10)

1. The utility model provides a wind-powered electricity generation blade with multistage grid sawtooth, includes blade leading edge (21) and blade trailing edge (22), its characterized in that, at suction surface (31) blade trailing edge (22) distribute sawtooth unit (40) along longitudinal axis direction, sawtooth unit (40) are including grid structure (41) and frame structure (42), grid structure (41) are including at least two-stage grid, and each stage the grid passes through frame structure (42) fixed connection in proper order, and each stage the grid with blade leading edge (21) to the horizontal direction that blade trailing edge (22) extended forms contained angle deltanN is the number of stages of the grating, and the included angle deltanLess than 90 °;
wherein, each grade of the grating is distributed with an upper row of saw teeth (43) and a lower row of saw teeth (44), the upper row of saw teeth (43) and the lower row of saw teeth (44) are arranged along the longitudinal axis direction in a staggered mode, and the lower row of saw teeth (44) forms an outer wide included angle beta with the frame where the lower row of saw teeth (44) is arranged1Is larger than the outer wide included angle beta formed by the upper row of sawteeth (43) and the frame on which the upper row of sawteeth is positioned2。
2. The wind blade of claim 1 wherein said included angle δnThe following conditions are satisfied:
δn＝α+(n-1)θ；
wherein alpha is a basic angle value, the numerical range is 20-40 degrees, theta is a gradient angle value, and the numerical range is 5-15 degrees.
3. As claimed in claim1 the wind power blade is characterized in that the outer wide included angle beta1At an included angle beta with the outer side2The following conditions are satisfied:
β2＜β1＜30°。
4. wind blade according to claim 1, characterized in that the edges of the upper row of serrations (43) and/or the lower row of serrations (44) are provided with small serrations and/or dimples.
5. The wind blade as set forth in claim 1, characterized in that the upper row of serrations (43) and/or the lower row of serrations (44) is made of soft material.
6. The wind turbine blade as claimed in claim 1, wherein the sawtooth unit (40) is connected to the blade trailing edge (21) by gluing or snapping.
7. The wind power blade according to claim 1, wherein the saw tooth units (40) are arranged from the blade tip (12) to the longitudinal axis of the blade root (11), and the length of the saw tooth units (40) is 60-70% of the length of the blade.
8. The wind blade as set forth in claim 1 wherein said louvers of each of said stages have different sizes of serrations, said serrations of said louvers of a succeeding stage being equally scaled from said sizes of said serrations of said louvers of a preceding stage, said equal scaling being in the range of 0-80%.
9. Wind turbine blade according to claim 1, characterized in that the surface of the edge frame structure (42) is provided with holes and/or serrations and/or dimples.
10. Wind turbine comprising a wind turbine blade according to any of claims 1 to 9.
CN202110414479.3A 2021-04-16 2021-04-16 Wind power blade with multistage grid sawteeth and wind turbine generator Active CN113107757B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102562436A (en) * 2010-12-16 2012-07-11 通用电气公司 Noise reducer for rotor blade in wind turbine
CN106460800A (en) * 2014-06-18 2017-02-22 西门子公司 Rotor blade with noise reduction means
CN109790818A (en) * 2016-09-09 2019-05-21 维斯塔斯风力系统有限公司 For installation into the method for the device with installation of the wind turbine blade device
EP3587799A1 (en) * 2018-06-27 2020-01-01 Siemens Gamesa Renewable Energy A/S Aerodynamic structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102562436A (en) * 2010-12-16 2012-07-11 通用电气公司 Noise reducer for rotor blade in wind turbine
CN106460800A (en) * 2014-06-18 2017-02-22 西门子公司 Rotor blade with noise reduction means
CN109790818A (en) * 2016-09-09 2019-05-21 维斯塔斯风力系统有限公司 For installation into the method for the device with installation of the wind turbine blade device
EP3587799A1 (en) * 2018-06-27 2020-01-01 Siemens Gamesa Renewable Energy A/S Aerodynamic structure

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